A147439 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1010-1111-1010 pattern in any orientation.

1, 1, 1, 1, 1, 3, 9, 19, 46, 175, 744, 3837, 22276, 149923, 1180818, 11235559

Offset

1,6

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example
.0.0.0.0.1.0.1.0
.0.0.0.0.1.1.1.1
.0.0.0.0.1.0.1.0
.0.0.0.0.0.0.0.0
.1.1.1.0.0.0.0.0
.0.1.0.0.0.0.0.0
.1.1.1.0.0.0.0.0
.0.1.0.0.0.0.0.0

Crossrefs

Sequence in context: A147463 A095828 A028377 * A091411 A279682 A102001

Adjacent sequences: A147436 A147437 A147438 * A147440 A147441 A147442

Keyword

nonn

Author

R. H. Hardin

Status

approved